Quick connects for BOV, bailout cylinders etc.

plazma

plazma

Just add ice & water
I was looking for different quick connect options. Most use Swagelok QC6 or CEJN 221.

Has anyone tried CEJN DN6 series?
You can get it in DESO model like Swagelok QC6.
"The Non-Drip design of the Series ensures practically zero spillage and eliminates pollution and air inclusion during connection and disconnection."
 
Are they designed for fluids ?. The UK CEJN distributor lives fairly close to me and I contacted him a couple of times last year as I wanted to try the CEJN 345's. Unfortunately he was pretty disinterested. Wouldn't sell to me direct and then failed to arrange a purchase through one of his local stockists. I gave up in the end. On paper they look good though...
 
Teppo said:
The cold water version from XS scuba site, i should able to get to Finland for 40€/pc

Teppo
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Ok. That is the same as CEJN 221. No low spill or double end shutt off.

I'll try to get the DN6 from a local CEJN supplier.
 
opheim said:
DESO (Double End ShutOff) is that both ends, the female and male are shut/closed when disconnected.
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Does both have to be presurized, if yes on the link I posted there is one DESO QuickDisconect. And Cehap one. I have some 90° elbows and QD foom piranha and all work excelent.
 
Igor P said:
Does both have to be presurized, if yes on the link I posted there is one DESO QuickDisconect. And Cehap one. I have some 90° elbows and QD foom piranha and all work excelent.
Click to expand...

Do you mean the one with one way valve? It is not the same.
Those connectors need an one way valve or a ball valve for a off-board hose.

CEJN DN6 and Swagelok QC6 series are available as DESO models where both end are shut of when disconnected. They also have a lot less water ingress when connecting under water.

Maybe it would be a good idea to test these different connectors with a transparent tube where you can see how much water gets in when connected under water.

I'm interested about the DN6 connectors since I have many local CEJN resellers and they may be much cheaper than the Swagelok QC6 models.
 
Yes I had in mind that one with one way valve.
Why would there be problems using ofboard? You feed them manualy and not throught orifice... Or I misunderstood something..
Best,

Igor P

Sent ftom my GT-I5800 using Tapatalk.
 
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Igor P said:
Yes I had in mind that one with one way valve.
Why would there be problems using offboard? You feed them manually and not through orifice... Or I misunderstood something..
Best,

Igor P
Click to expand...

It's always better to have minimum water ingress. Swagelok QC6 is expensive and can't be bought locally. That's why I looked for different models. CEJN got many interesting models and here is many local CEJN resellers.

Most divers use either Swagelok QC6 or CEJN221 compatible connectors. The CEJN 221 needs an one way or ball valve. That makes the water ingress worse since all the water inside the nipple and ball/one way valve goes into the hose when connecting.
 
In actual fact... the Swagelok QC-x fittings are some of the worst ones for diving use. The stems get bent, they are finicky, clog with cave-crumbs, etc. They are used because they are familiar, not because they are particularly well suited.

The Cis Lunar Mk-5P used flush faced, no-spill, zero-loss fittings made by Parker-Hannifin. These are the gold standard for a connector: impossible to clog, no exposed stems, etc. They really ought to be the standard for diving. Unsure why the "Industry" went to inferior substitites.



http://www.snap-titequickdisconnects.com/products/drybreak_non-spill_couplings/71_series/index.html




Dave

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What would the cost of the 71 series connectors you listed? And how is the connection achieved to the hose (in other words do you need a few other fittings to make the connection?)


Sent from my Shearwater Predator...
 
The website had 1/2 inch female couplings for $238 and male for $85.. so female on the CCR and male on the bottles seems cheaper..

The 1/2" are rated to 345 bar the 1" to 280 AMD are nearly double the price.. there's a purchase online button...

Could the price be the reason for sourcing alternative connectors?
 
The correct ones are the 1/4 inch ones. They can be connected with ease to normal hoses, using Omniswivel parts, or custom hoses can be made.

Unsure exact costs, you need to buy from a local Parker Stockist. Comparable to the others though.


Dave

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Dave Sutton said:
In actual fact... the Swagelok QC-x fittings are some of the worst ones for diving use. The stems get bent, they are finicky, clog with cave-crumbs, etc. They are used because they are familiar, not because they are particularly well suited.

The Cis Lunar Mk-5P used flush faced, no-spill, zero-loss fittings made by Parker-Hannifin. These are the gold standard for a connector: impossible to clog, no exposed stems, etc. They really ought to be the standard for diving. Unsure why the "Industry" went to inferior substitites.



http://www.snap-titequickdisconnects.com/products/drybreak_non-spill_couplings/71_series/index.html




Dave

.
Click to expand...

Dave the like looks like fitting iv seen on hydraulic line,s
the ones iv used away,s seem hard to push together,

whats your thinking ,, edit .. no need to answer just read above post ..
 
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Force = pressure X surface area.

The larger the connector, the more area.

The higher the pressure, the higher the force per area.


Hydraulics run at 1500-3000 PSI, and they usually use fairly large connectors. No doubt they are hard to plug.

We're using 140 PSI and smaller connectors. Basically you'll feel the same push-on pressure from any connector connecting a similar pressure to a similar diameter connection. These then are about the same as plugging in a CEJN.


Empirical observation: No problems noted using these on my CIS Mk-5P for many years.
CIS uses male for dil and female for 02 on the rig, cylinder hoses are reversed.


Dave

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